问题补充：
—I called you at 4:00 yesterday afternoon, but no one answered.
—Sorry, I with my friends at that time.
A. swim
B. swam
C. will swim
D. was swimming
答案：
A. swim
B. swam
C. will swim
(答案→)D. was swimming
解析： 考查时态。根据时间状语yesterday afternoon,可知要用过去时态；再据at that time，可知要用过去进行时态。所以选D。
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